GMC YUKON 2018 Owner's Manual page 225

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224
Driving and Operating
driving conditions. This setting
provides slightly lower fuel economy
than 2 .
Do not use AUTO mode,
if equipped, to park on a steep
grade with poor traction such as ice,
snow, mud, or gravel. In AUTO
mode only the rear wheels will hold
the vehicle from sliding when
parked. If parking on a steep grade,
use 4 to keep all four wheels
engaged.
4 (Four-Wheel Drive High) : Use
this position when extra traction is
needed, such as when driving on
snowy or icy roads, when
off-roading, or when plowing snow.
4 (Four-Wheel Drive Low) : This
setting engages the front axle and
delivers extra torque. Choose 4
when driving off-road in deep sand,
deep mud, or deep snow, and while
climbing or descending steep hills.
Shifting into 4 will turn Traction
Control and StabiliTrak off. See
Traction Control/Electronic Stability
Control 0 229.
Shifting Into 4 or AUTO
Turn the knob to the 4 or AUTO
position at any speed, except from 4
. The indicator light will flash while
shifting and will remain on when the
shift is completed.
Shifting Into 2
Turn the knob to 2 at any speed,
except when shifting from 4 . The
indicator light will flash while shifting
and will remain on when the shift is
completed.
Shifting Into 4
When 4 is engaged, keep vehicle
speed below 72 km/h (45 mph).
To shift:
1. The ignition must be on and
the vehicle must be stopped or
moving less than
5 km/h (3 mph) with the
transmission in N (Neutral). It is
best for the vehicle to be
moving
1.6 to 3.2 km/h (1 to 2 mph).
2. Turn the knob to 4 . Wait for
the 4 indicator light to stop
flashing before shifting the
transmission into gear.
Caution
Shifting the transmission into gear
before the requested mode
indicator light has stopped
flashing could damage the
transfer case.
If the transmission is in gear and/or
moving more than 5 km/h (3 mph),
the 4 indicator light will flash for
30 seconds and not complete the
shift. After 30 seconds the transfer
case will shift to 4 . Turn the knob
to 4 to display the indicator. With
the vehicle moving less than 5 km/h
(3 mph), and the transmission in
N (Neutral), attempt the shift again.

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